To practice Dharma means to apply Buddha’s teachings in your daily life.
The purpose of this Dharma practice is to enable us to attain permanent liberation from lower rebirth.
At present we are human and free from lower rebirth, but this is only a temporary and not a permanent liberation from lower rebirth. Until we gain a deep realization of refuge, we shall have to take lower rebirth again and again in countless future lives.
We attain permanent liberation from lower rebirth by sincerely relying upon the Three Jewels: Buddha – the source of all refuge, Dharma – the realization of Buddha’s teachings, and Sangha – pure Dharma practitioners who help us with our spiritual practice.
Dharma is like medicine that prevents the sufferings of the three lower realms, Buddha is the doctor who gives us this medicine, and the Sangha are the nurses who assist us. Understanding this, we go for refuge to Buddha, Dharma, and Sangha and sincerely apply the Dharma to our lives.